Updated test so they run with every time zone
diff --git a/libcloud/test/common/test_osc.py b/libcloud/test/common/test_osc.py
index 8d7ca1b..f3f7c19 100644
--- a/libcloud/test/common/test_osc.py
+++ b/libcloud/test/common/test_osc.py
@@ -57,7 +57,7 @@
         )
         self.assertIn(
             'Credential=my_key/{}/my_region/my_service/osc4_request'.format(
-                datetime.now().strftime('%Y%m%d')
+                datetime.utcnow().strftime('%Y%m%d')
             ),
             headers["Authorization"]
         )